I've been using these ValBox #10 Security Envelopes for months now, and they've completely replaced the flimsy ones I used to buy. The security tint is no joke – you really can't see through them, which gives me peace of mind when mailing sensitive documents.

What surprised me most was the adhesive strip. It's not one of those weak, half-hearted glue strips that barely holds. This one actually seals tight on the first try – no need for extra tape like with other brands I've tried.

As someone who mails about 20-30 documents weekly, I appreciate how they feed smoothly through my office printer without jamming. The paper has just the right weight – sturdy enough to feel secure but not bulky enough to increase postage costs.

The self-seal feature is a game-changer when I'm processing large mailings. No more dealing with messy glue sticks or worrying about envelopes popping open in transit. These stay sealed through everything – I've even had them survive being stuffed in an overfilled mailbox during rainy weather!

For the price point, you're getting premium quality that outperforms what you'd find at big box stores. After trying multiple brands, these are the only ones I'll buy now for both business and personal secure mailings.